We’re now two months into the six-month air pollution monitoring exercise that is going on all over London – see this post for more details. The results for the first two months have now been added to the air pollution map.
The pollution that is being monitored is nitrogen dioxide. This mainly comes for diesel engines and, as well as causing health problems itself, can be used as an indicator of the overall level of pollution. The legal limit for this pollutant is 40µg/m3. The level measured in November was 78µg/m3 and in December it was 68µg/m3 – both well in excess of the legal limit.